Android学习之——GridView

 1 package com.johntsai.gridviewdemo;
 2 
 3 import java.util.ArrayList;
 4 import java.util.HashMap;
 5 
 6 import android.app.Activity;
 7 import android.content.Intent;
 8 import android.os.Bundle;
 9 import android.view.View;
10 import android.widget.AdapterView;
11 import android.widget.AdapterView.OnItemClickListener;
12 import android.widget.GridView;
13 import android.widget.SimpleAdapter;
14 import android.widget.Toast;
15 
16 public class MainActivity extends Activity {
17     private int ids[]={
18         R.drawable.aaa,
19         R.drawable.bbb,
20         R.drawable.ccc,
21         R.drawable.ddd,
22         R.drawable.eee,
23         R.drawable.fff,
24         R.drawable.ggg,
25         R.drawable.hhh,
26         R.drawable.aaa
27     };
28     private GridView gridView;
29     @Override
30     protected void onCreate(Bundle savedInstanceState) {
31         super.onCreate(savedInstanceState);
32         setContentView(R.layout.activity_main);
33         
34         gridView = (GridView)findViewById(R.id.gridview);
35     
36         ArrayList<HashMap<String, Object>> images = new ArrayList<HashMap<String,Object>>();
37         for(int i=0;i<ids.length;i++){
38             HashMap<String, Object>map = new HashMap<String, Object>();
39             map.put("Image", ids[i]);
40             map.put("Id", "Android"+i+"号");
41             images.add(map);
42         }
43     
44         SimpleAdapter adapter = new SimpleAdapter(this,
45                 images, R.layout.gridview_item, 
46                 new String[]{"Image","Id"}, new int[]{R.id.imageItem,R.id.idItem});
47         gridView.setAdapter(adapter);
48         
49         gridView.setOnItemClickListener(new OnItemClickListener() {
50 
51             @Override
52             public void onItemClick(AdapterView<?> parent, View view,
53                     int position, long id) {
54                  Toast.makeText(getApplicationContext(), 
55                          "你点击了" + position+"号", Toast.LENGTH_LONG).show();
56 
57             }
58         });
59     }
60 }

<?xml version="1.0" encoding="utf-8"?>
<GridView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/gridview"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:columnWidth="90dp"
    android:numColumns="auto_fit"
    android:stretchMode="columnWidth"
    android:gravity="center"
/>
<!--  
  android:columnWidth="90dp" 列宽设置为90dp
  android:numColumns="auto_fit"列数设置为自动
  android:stretchMode="columnWidth" 缩放与列的宽度同步
  -->

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     android:layout_width="match_parent"
 4     android:layout_height="match_parent" 
 5     android:paddingBottom="4dip">
 6     
 7     <ImageView 
 8         android:id="@+id/imageItem"
 9         android:layout_height="70dp"
10         android:layout_width="70dp"
11         android:layout_centerHorizontal="true"
12         />
13     <TextView 
14         android:id="@+id/idItem"
15         android:layout_height="wrap_content"
16         android:layout_width="70dp"
17         android:layout_centerHorizontal="true"
18         android:layout_below="@id/imageItem"
19         />
20 </RelativeLayout>